The invention discloses a method for preparing
chlorophyll cuprate and
sodium copper chlorophyll. The method comprises the following steps: taking fresh
plant stem leaves, adding 90-95% of
ethanol, pulping and extracting, and pressing and juicing; roughly filtering the juice by using a gauze of 180-300 meshes, and subsequently carrying out high-speed
centrifugation with the speed of 4,000-6,000rpm; adding 5% of a NaOH solution and adjusting the pH value to be 11-12, saponifying, carrying out vacuum concentration and recycling the
ethanol; adjusting the pH value to be 2-3, adding 10% of CuSO4 solution for
copper substitution; subsequently sequentially washing
sediment obtained from suction
filtration in
warm water for three times and washing the
sediment in a low-degree
ethanol solution for three times; directly
drying the obtained
sediment so as to obtain
chlorophyll cuprate solid powder; dissolving the washed sediment by using
acetone; adding 5% of a NaOH ethanol solution to adjust the pH value to be 10-12, washing the sediment, and
drying the sediment after suction
filtration so as to obtain
sodium copper chlorophyll
solid powder. The recycling rate of the method is 0.7-1.0%, and the prepared
sodium copper chlorophyll meets various requirements of the GB36406-2011 standard. According to the method, as two time-consumption steps of concentration and
saponification are combined together, the time is greatly shortened, the step of
organic solvent extraction is eliminated, the process is simplified, and the cost is lowered.